Function compareErrorPosition

packages/forms/signals/src/field/validation.ts:435–444

* Compares the position of two validation errors by the position of their corresponding field * binding directive in the DOM. * - For errors with multiple field bindings, the earliest one in the DOM will be used for comparison. * - For errors that have no field bindings, they will be considered t

(
  a: ValidationError.WithFieldTree,
  b: ValidationError.WithFieldTree,
)

 * - For errors that have no field bindings, they will be considered to come after all other errors.
 */
function compareErrorPosition(
  a: ValidationError.WithFieldTree,
  b: ValidationError.WithFieldTree,
): number {
  const aEl = getFirstBoundElement(a);
  const bEl = getFirstBoundElement(b);
  if (aEl === bEl) return 0;
  if (aEl === undefined || bEl === undefined) return aEl === undefined ? 1 : -1;
  return aEl.compareDocumentPosition(bEl) & Node.DOCUMENT_POSITION_PRECEDING ? 1 : -1;
}